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Maybe its luck, but I finally found a wireless mouse and BT headphones that I haven't got anything to complain about. Around 5 years ago I made the same test and came back to wired versions. I suppose AirPods, with that price tag, must be much better.
What are they?
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I'd guess that max bluetooth transmission strength is less than the maximum allowed by the FCC's spec for the 2.4ghz band (bluetooth and many other things use this). We'll probably just end up in an arms race of transmission strength until we hit legal limits.
Basically already done in Manhattan. If you want working internet in an apartment building, it has to be 5ghz at this point. Everyone's WiFi transmitters are cranked up to max to try to punch through the noise floor, plus all the city infra (7 train CBTC, the train bluetooth beacons, commercial/public WiFi, LinkNYC, etc)